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Analog Devices Inc. LTC3220IPF-1#TRPBF
- Part No.:
- LTC3220IPF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
LTC3220IPF-1#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 20MA 28UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,329
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Product details
Overview
LTC3220IPF-1#TRPBF from Analog Devices (formerly Linear Technology) is an 18-channel universal LED driver IC with integrated multi-mode charge pump, I²C-controlled 6-bit linear DACs, and independent blink/gradation control per channel. It delivers up to 20mA per channel (360mA total), operates from 2.9V to 5.5V input, and supports 1x/1.5x/2x charge pump modes for dynamic efficiency optimization in QVGA+ display backlighting.
For engineers reviewing the LTC3220IPF-1#TRPBF datasheet, LTC3220IPF-1#TRPBF pinout, LTC3220IPF-1#TRPBF application, or LTC3220IPF-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed I²C address (0011101), thermal-rated package details, and real-world selection guidance for multi-LED lighting systems requiring precise current matching and low-noise operation.
Technical Context
The LTC3220IPF-1#TRPBF implements a dual-phase non-overlapping 850kHz oscillator driving a switched-capacitor charge pump with automatic mode switching: it starts in 1x mode (VIN → CPO), transitions to 1.5x mode upon first LED dropout (targeting 1.5×VIN ≤ 4.6V), then to 2x mode upon subsequent dropout (targeting 2×VIN ≤ 5.1V). Mode resets occur on I²C register writes, gradation ramp completion, or blink period end.
Each of its 18 ULED outputs functions as a programmable current source (0–20mA in 64 linear steps) or configurable open-drain GPO, with independent control via REG1–REG18 and shared gradation/blink timing in REG19. Dropout detection is disabled in GPO mode, and soft-start limits inrush during mode transitions with 125µs linear current ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 2.9V to 5.5V - supports single-cell Li-ion, USB, and wide-input portable power rails without external LDO. |
| Max Total Output Current | 360mA - enables full drive of 18×20mA LEDs for high-brightness QVGA+ displays or RGB keypad arrays. |
| LED Current Accuracy | ±1.5% matching between any two outputs at 50% full scale - ensures uniform luminance across multi-segment backlight zones. |
| Charge Pump Efficiency | Up to 91% - achieved via adaptive 1x/1.5x/2x mode selection and slew-limited flying capacitor switching to minimize EMI. |
| I²C Address | 0011101 (7-bit) - distinct from LTC3220 (0011100), enabling co-location of both variants on same bus for mixed-channel systems. |
| Operating Temperature | –40°C to +125°C - qualified for automotive infotainment displays and industrial HMI panels requiring extended thermal robustness. |
| Package | 28-lead 4mm × 4mm UTQFN (0.55mm height) with exposed pad - enables ultra-thin mobile designs and efficient thermal dissipation via PCB ground soldering. |
Pinout & Package
28-lead ultrathin QFN (UTQFN) package, 4mm × 4mm × 0.55mm, with exposed thermal pad (Pin 29) required to be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ULED1–ULED18 (Pins 1–9, 13–21) | Universal current source outputs | Each sources 0–20mA with 6-bit DAC control; configurable as open-drain GPO with strong pull-down or current-limit modes. |
| VIN (Pin 24) | Main power input | Supplies entire device; requires 2.2µF ceramic bypass capacitor; powers charge pump and internal logic. |
| DVCC (Pin 10) | Digital I/O supply | Sets logic reference for SCL/SDA/RST; must be ≥1.5V; UVLO threshold at 1V; requires 0.1µF ceramic decoupling. |
| SCL / SDA (Pins 11 / 12) | I²C serial interface | Standard 2-wire bus (400kHz max); referenced to DVCC; require external pull-ups; slave-only communication. |
| RST (Pin 25) | Active-low reset | Asynchronously clears all registers and forces shutdown; resets charge pump mode to 1x upon release. |
| CPO (Pin 28) | Charge pump output | Delivers regulated voltage (1x/1.5x/2x VIN) to power all ULEDs; requires 4.7µF ceramic output capacitor. |
| C1P/C1M/C2P/C2M (Pins 27/23/26/22) | Flying capacitor connections | Support 2.2µF ceramic caps per pair; internal slew limiting reduces conducted/radiated EMI during switching. |
Key Features
| Feature | Design Value |
|---|---|
| 18-channel 6-bit linear DAC control | Enables independent 64-step brightness tuning per LED without external resistors or PWM controllers. |
| Auto-switching 1x/1.5x/2x charge pump | Maintains >85% efficiency across varying LED forward voltages by dynamically adjusting CPO voltage only when needed. |
| Programmable blink & gradation | Configurable on/off timing (1.25s/2.5s periods) and current ramp rates (0.24s/0.48s/0.96s) per channel via REG19. |
| GPO mode with dual operating states | Switches ULED pins to open-drain outputs with selectable strong pull-down (~3µA quiescent) or current-limited (≤20mA) operation. |
| Thermal and short-circuit protection | Internal overtemperature shutdown and indefinite CPO short-circuit tolerance prevent damage during fault conditions. |
Applications
| QVGA+ Display Backlighting | RGB Keypad Illumination |
|---|---|
Use Scenario: Driving 18-segment backlight for QVGA+ resolution LCDs in video phones and portable media players. IC Role / Device Role / Timing Role: Universal current source controller with per-segment dimming, blink, and gradation synchronized to UI animation frames. Use Value: Eliminates need for discrete current-setting resistors and external PWM generators while maintaining ±1.5% current matching across segments. |
Use Scenario: Controlling red/green/blue LEDs on alphanumeric keypads in automotive dashboards and industrial HMIs. IC Role / Device Role / Timing Role: Independent 3-channel current driver with programmable blink patterns and smooth color transition via gradation ramps. Use Value: Enables dynamic status indication (e.g., pulse-on-alert, fade-on-inactive) using single IC instead of three separate LED drivers. |
| Multi-Zone Status Lighting | Low-EMI Portable Lighting |
Use Scenario: Powering segmented status indicators (e.g., battery level, signal strength, connectivity) on handheld test equipment. IC Role / Device Role / Timing Role: Configurable universal current source array supporting mixed-color LEDs with independent on/off and brightness control. Use Value: Reduces BOM count by consolidating 18 discrete LED drivers into one 4mm × 4mm package with unified I²C configuration. |
Use Scenario: Backlighting for medical handheld devices where radiated emissions must comply with IEC 60601-1 EMC requirements. IC Role / Device Role / Timing Role: Low-noise charge pump with slew-limited flying capacitor switching and 850kHz fixed-frequency operation. Use Value: Achieves <100mVpp CPO ripple in 2x mode (AC-coupled) and meets Class B conducted/radiated EMI limits without ferrite beads or shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3729-QFLS4-TR | 28-channel, 40mA max/channel, SPI interface, no auto charge pump mode switching | Higher channel count and current, but requires external boost converter and lacks adaptive efficiency optimization | Select when >18 channels or >20mA/channel are required; accept higher layout complexity and fixed-boost overhead |
| TPS61196RGER | 18-channel, 25mA max/channel, I²C interface, fixed 2x boost only, no gradation control | Higher per-channel current and integrated FETs, but no 1x/1.5x fallback or software-configurable ramp timing | Select for simpler systems needing only basic on/off/brightness control without animation features |
Compared with IS31FL3729-QFLS4-TR and TPS61196RGER, the LTC3220IPF-1#TRPBF uniquely combines adaptive charge pump efficiency, per-channel gradation timing, and GPO reconfigurability in a thermally rated industrial package-making it optimal for compact, animated, and EMI-sensitive LED systems.
Availability
LTC3220IPF-1#TRPBF is available at Aetrix Electronics and suitable for QVGA+ display backlighting, RGB keypad illumination, and multi-zone status lighting requiring stable component supply across automotive, industrial, and portable electronics programs.
Supply support for LTC3220IPF-1#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3220 family was designed specifically for space-constrained, multi-LED lighting applications demanding high current accuracy, low EMI, and rich animation control-targeting video phones, portable HMIs, and automotive interior lighting.
FAQ
What is the I²C address of the LTC3220IPF-1#TRPBF?
The LTC3220IPF-1#TRPBF uses a factory-programmed 7-bit I²C slave address of 0011101 (0x3A in 8-bit write format). This distinguishes it from the LTC3220 (0011100), allowing both variants to coexist on the same I²C bus for flexible system partitioning. The R/W bit must be 0 for write operations, as the device is receive-only.
How does the LTC3220IPF-1#TRPBF handle LED dropout conditions?
The LTC3220IPF-1#TRPBF detects dropout when any enabled ULED pin voltage falls below the level required to sustain its programmed current. Upon first dropout, it switches from 1x to 1.5x mode after ~400µs; a second dropout triggers transition to 2x mode. Mode reverts to 1x after any I²C register write, gradation ramp completion, or blink period end-ensuring dynamic efficiency without manual intervention.
Can the ULED pins of the LTC3220IPF-1#TRPBF be used as general-purpose outputs?
Yes - each ULED pin on the LTC3220IPF-1#TRPBF can be configured as an I²C-controlled open-drain general-purpose output (GPO) by setting Bits 6 and 7 of its corresponding data register (REG1–REG18) to logic high. In GPO mode, dropout detection is disabled, and the pin supports either strong pull-down (~3µA quiescent) or current-limited (≤20mA) operation, extending functionality beyond LED driving.
What is the maximum allowable LED forward voltage supported by the LTC3220IPF-1#TRPBF?
The LTC3220IPF-1#TRPBF supports LED forward voltages up to 5.1V via its 2x charge pump mode (2×VIN, capped at 5.1V). With a 5.5V VIN maximum, the CPO output reaches 5.1V, enabling direct drive of high-Vf white or blue LEDs without external boost circuitry. Dropout voltage is specified at 120mV at full-scale 20mA, confirming headroom for typical 3.0–3.6V white LEDs.
Does the LTC3220IPF-1#TRPBF include thermal protection?
Yes - the LTC3220IPF-1#TRPBF integrates overtemperature protection that disables the charge pump and all ULED outputs when junction temperature exceeds 125°C. This safeguard prevents permanent damage during sustained overload or poor PCB thermal design. Operation resumes automatically once temperature falls below the hysteresis threshold, and the device is rated for continuous operation from –40°C to +125°C ambient.
LTC3220IPF-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- -
- Number of Outputs:
- 18
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- 850kMz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-UTQFN (4x4)
LTC3220IPF-1#TRPBF FAQ
1.How can I place an order for LTC3220IPF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3220IPF-1#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3220IPF-1#TRPBF reliable?
The price and inventory of LTC3220IPF-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3220IPF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3220IPF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3220IPF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3220IPF-1#TRPBF?
LTC3220IPF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3220IPF-1#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3220IPF-1#TRPBF?
For technical support, including LTC3220IPF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3220IPF-1#TRPBF requirements.
6.How does Aetrix verify that LTC3220IPF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3220IPF-1#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3220IPF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3220IPF-1#TRPBF?
All LTC3220IPF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3220IPF-1#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3220IPF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3220IPF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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